From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Production inspection and test results for the Watford Type IS.12 Magneto.
| Identifier | ExFiles\Box 43\4\ Scan080 | |
| Date | 11th February 1927 | |
| X 4021 WATFORD TYPE IS.12 MAGNETO. X.4021. PRODUCTION INSPN. & TEST. | Date | Magneto No. | (1) Remarks | (2) Range (Degrees) <15° | (3) Remarks | (4) Taper (AHS) 5.5 s | (5) Remarks | (6) Remarks | (7) Min. cutting in speed. (a) 170 (b) 210 (c) 260 | |---|---|---|---|---|---|---|---|---| | 9-12-26 | 83134 | OK | 15° | OK | 4 | OK | OK | 5.0 mm gaps. 150 175 190 | | 10-12-26 | 83135 | OK | 15° | OK | (too loose) 2.5 | OK | OK | 5.0 mm gaps 130 150 185 | | 3-1-27 | 83137 | OK | 15° | — | — | OK | OK | 180 220 260 | | 24-1-27 | 83119 | OK | 14° | OK | (too loose) 3 | OK | OK | 5.0mm gaps 200 270 310 | | 24-1-27 | 83120 | OK | 15° | OK | — | OK | OK | 5.0 mm gaps 150 200 230 | | 11-2-27 | 83132 | OK | 15° | OK | (OK.) 6.75 | OK | misfires advanced. | — 290 300 | | 11-2-27 | 83133 | OK | 15° | OK | (excessive) 12.0 | OK | misfires advanced | — 300 270 | 10.12.26. | ||